Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Conceptual Questions)>Q 7

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Photoelectric effect takes place in element A. Its work function is 2.5 eV and threshold wavelength is $λ$ . An other element B is having work function of 5 eV. Then find out the maximum wavelength that can produce photoelectric effect in B :

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Important Questions on Dual Nature of Matter and Radiation

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Conceptual Questions)>Q 8

When light of wavelength lesser than 6000

\overset{o}{A}

is incident on a metal, electrons are emitted. The approximate work-function of the metal is :

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Conceptual Questions)>Q 9

Surface of sodium is illuminated by a light of wavelength 6000

\overset{o}{A}

. Work function of sodium is 1.6 eV. Then minimum K.E. of emitted electrons is

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Conceptual Questions)>Q 10

The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential in volt is

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Conceptual Questions)>Q 11

When a point source of monochromatic light is placed at a distance of

0.2 m

from a photoelectric cell, the cut-off voltage and the saturation current are

0.6 V

and

18 mA

respectively. If the same source is placed

0.6 m

away from the photoelectric cell, then :-

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Conceptual Questions)>Q 12

The maximum wavelength of light for photoelectric effect from a metal is

200 nm

. The maximum kinetic energy of electron which is emitted by the radiation of wave length

100 nm

will be :

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Conceptual Questions)>Q 13

The stopping potential as a function of frequency of incident radiation is plotted for two different surfaces $A$ and $B$ . The graphs show that the work function of $A$ is

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Conceptual Questions)>Q 14

The slope of graph drawn between stopping potential and frequency of incident light for a given surface will be :-

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Conceptual Questions)>Q 15

By photo electric effect, Einstein proved :-